package com.android.library.utils;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;

import java.util.Iterator;
import java.util.Stack;

/**
 * @author : qushaohua
 */
public class AppManager {

    private static final String TAG = "AppManager";

    private static Stack<Activity> activityStack;
    private static AppManager instance;

    private AppManager() {
    }

    /**
     * 单一实例
     */
    public static AppManager getAppManager() {
        if (instance == null) {
            instance = new AppManager();
        }
        return instance;
    }

    /**
     * 添加Activity到堆栈
     */
    public void addActivity(Activity activity) {
        if (activityStack == null) {
            activityStack = new Stack<Activity>();
        }
        activityStack.add(activity);
    }

    /**
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    public Activity currentActivity() {
        Activity activity = activityStack.lastElement();
        return activity;
    }

    /**
     * 结束当前Activity（堆栈中最后一个压入的）
     */
    public void finishActivity() {
        Activity activity = activityStack.lastElement();
        finishActivity(activity);
    }

    /**
     * 结束指定的Activity
     */
    public void finishActivity(Activity activity) {
        if (activity != null) {

            Iterator<Activity> iterator = activityStack.iterator();
            while (iterator.hasNext()) {
                Activity activitySave = iterator.next();
                if (activity != null && activity.getClass().equals(activitySave.getClass())) {
                    iterator.remove();
                    if (!activity.isFinishing()) {
                        activity.finish();
                        activity = null;
                    }
                }
            }
        }
    }

    /**
     * 获取指定activity
     */
    public Activity getActivity(Class<?> cls){
        Iterator<Activity> iterator = activityStack.iterator();
        while (iterator.hasNext()) {
            Activity activitySave = iterator.next();
            if (cls.equals(activitySave.getClass())) {
                return activitySave;
            }
        }
        return null;
    }

    /**
     * 结束指定类名的Activity
     */
    public void finishActivity(Class<?> cls) {

        Iterator<Activity> iterator = activityStack.iterator();
        while (iterator.hasNext()) {
            Activity activitySave = iterator.next();
            if (cls.equals(activitySave.getClass())) {
                iterator.remove();
                if (!activitySave.isFinishing()) {
                    activitySave.finish();
                }
            }
        }
    }

    /**
     * 结束指定类名的Activity
     */
    public boolean isExistActivity(Class<?> cls) {
        Iterator<Activity> iterator = activityStack.iterator();
        while (iterator.hasNext()) {
            Activity activitySave = iterator.next();
            if (cls.equals(activitySave.getClass())) {
                return true;
            }
        }
        return false;
    }

    /**
     * 结束指定的Activity
     */
    public boolean isExistActivity(Activity activity) {
        if (activity != null) {
            Iterator<Activity> iterator = activityStack.iterator();
            while (iterator.hasNext()) {
                Activity activitySave = iterator.next();
                if (activity.getClass().equals(activitySave.getClass())) {
                    return true;
                }
            }
        }
        return false;
    }


    /**
     * 结束所有Activity
     */
    public void finishAllActivity() {
        if (activityStack != null) {
            for (int i = 0, size = activityStack.size(); i < size; i++) {
                if (null != activityStack.get(i)) {
                    activityStack.get(i).finish();
                }
            }
            activityStack.clear();
        }
    }

    /**
     * 退出应用程序
     */
    public void appExit(Context context) {
        finishAllActivity();
        ActivityManager activityMgr = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        System.exit(0);

    }
}
